US President Donald Trump’s pullout from the Paris Agreement will push up global temperatures nearly half a degree Celsius (0.9 degrees Fahrenheit) by 2100, according to a report released Wednesday at UN climate talks in Bonn.

If all countries—including the United States—honour carbon-cutting pledges under the 196-nation treaty, the world would see 2.8 C of global warming above pre-industrial levels, the Climate Action Tracker (CAT) research group had previously calculated.

That is not nearly good enough to avoid climate catastrophe, scientists say.

The Paris pact, adopted in 2015, calls for capping the rise at “well below” 2 C, and even 1.5 C if possible, to avoid climate-addled future of extreme drought, deadly heatwaves and superstorms made more destructive by rising seas.